
Industrial activity and conservation lands define this portion of the Allegheny Front at the Clearfield Co Centre Co boundary. The Penn Central railroad winds through the steep topography, serving the northern settlement of Glass City and the namesake village of Sandy Ridge. To the northwest, the landscape is heavily marked by several Strip Mine and Mine operations near Moshannon Creek, highlighting the region's coal heritage.
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6 editions found
1903 · Houtzdale
USGS Topo · 1:62,500
1905 · Houtzdale
USGS Topo · 1:62,500
1920 · Altoona
USGS Topo · 1:62,500
1922 · Philipsburg
USGS Topo · 1:62,500
1922 · Altoona
USGS Topo · 1:62,500
1923 · Tyrone
USGS Topo · 1:62,500
1929 · Tyrone
USGS Topo · 1:48,000
1933 · Tyrone
USGS Topo · 1:62,500
1939 · Philipsburg
USGS Topo · 1:62,500
1944 · Houtzdale
USGS Topo · 1:24,000